1957: The Japanese Supreme Court upholds a ban on D.H. Lawrence's novel Lady Chatterley's Lover. In the main piece of jurisprudence seeking to clarify the apparent contradiction between Article 21 of the Constitution and Article 175 of the Penal Code, the high court upholds the ban on obscenity, which it defines as "that which unnecessarily excites or stimulates sexual desire."

1976: Nagisa Oshima's Ai No Corrida (In the Realm of the Senses) is shown at the Cannes Film Festival. The film was shot in Kyoto, but the negative was developed and cut in Paris. As a trial balloon for a release of the film in Japan, a book containing the script and twelve film stills is published in Tokyo. In July the publisher is charged with obscenity. During the trial, Oshima requests that the high court explain the philosophical, political, legal, conceptual and practical visual standards used to define "that which unnecessarily excites or stimulates sexual desire."

1982: The Japanese Supreme Court declines to clarify the concept of obscenity any further, but nonetheless acquits Oshima.

2009: In a legal and semantic grey area that remains to this day, graphic materials imported into Japan are subject to subjective self-censorship: explicit anatomical representation is replaced with 'bokashi,' a fogging, blurring or scratching of male and female genitalia in films and publication